Even if Honecker (thank you as I could not remember his name) had gotten his army to fire, it would have been terrible for those killed but he still was finished, Gorbachov had pulled the plug and the writing was on the wall, the world had changed and Honecker did not see it.
Mubarak is not your average dictator, he is one with US backing up to now, he could use troops to fire with ak 47's and as horrible as it sounds the way the world works he probably would get away with that but not with fighters and helicoptors.
The US wants him in powerm they do not want to risk extremists getting some hold on power in such an important country, it borders Isreal, can you imagine what they are thinking right now, they dont want him gone either as he is a stable leader in a region that everyone hates them but if we see rockets fired from the sky on unarmed people from US made helicoptors that changes everything and Obama as the leader of the free world and as someone with an eye to getting re elected just can no longer support him in any way.
Mubarak is also a big part of the peace process, how can he sit at that table if his country in under curfew and killed his own people with figthers.
Trust me, he is a dead man walking, even if his army stamps out all this, the world will close its doors to Egypt and become like Libya was for last 30 years. He still can hold on to power but to do that he has to lose the world and his eye on history as being a peacemaker with Isreal.
All the big boys want him to stay, he is the safer bet, he falls and it 1989 all over again only this time in the sand and the US would prefer that not happen as they would fear extremists getting voted into power and if they do and its a country bordering Isreal well them democracy goes out the window. The difference is the US wanted 1989 to happen, they do not want the same thing in the middle east.